1990 Volvo 240 overdrive problem
#1
1990 Volvo 240 overdrive problem
Just got my 240 back on the road. Turns out it needed a new fuel control unit. But now I'm having another problem. The overdrive refuses to work properly and seems to have a mind of its own. It's an automatic and when you start the car sometimes the overdrive is engaged and sometimes it isn't.
When it isn't, pushing the O/D button only rarely works. Most times you push it, nothing happens (not even a click from the switch), then sometime later the overdrive comes on. Worse is that it will disengage overdrive on its own for no reason if you do manage to get it back on.
When it is engaged when you start the car, the O/D button works perfectly turning it off (O/D switch clicks when it does this). But it will rarely come back on by pressing the button. And once again you don't have to push the button for it to turn off. It'll do it by itself.
I've already pulled the O/D switch off of the car and tested the continuity. It is open unless you have the button pressed down all the way and doesn't stay closed. Don't know if that's normal because I can't find electrical specs for the switch anywhere.
When it isn't, pushing the O/D button only rarely works. Most times you push it, nothing happens (not even a click from the switch), then sometime later the overdrive comes on. Worse is that it will disengage overdrive on its own for no reason if you do manage to get it back on.
When it is engaged when you start the car, the O/D button works perfectly turning it off (O/D switch clicks when it does this). But it will rarely come back on by pressing the button. And once again you don't have to push the button for it to turn off. It'll do it by itself.
I've already pulled the O/D switch off of the car and tested the continuity. It is open unless you have the button pressed down all the way and doesn't stay closed. Don't know if that's normal because I can't find electrical specs for the switch anywhere.
#2
The switch seldom fails. First suspect is the od relay. Second suspect would be the wiring under the car leading from the od solenoid forward into the car. Over the years, exposed to road grime and debris, engine oil and transmission fluid, the wire insulation can break down and start shorting on the chassis.
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I just bought a 1990 240 DL and sometimes the OD worked most of the time it didn't... So I read this forum did what this guy said about checking the solder on the OD solenoid and sure enough one connection was broken... Soldered it again and it worked just fine.... Thanks alot only took 5 min and I'm sure it saved me lots of money....
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